Two possibilities exist: either we are alone in the Universe... - Arthur C. Clarke

"The only way to discover the limits of the possible is to go beyond them into the impossible."

"Magic's just science that we don't understand yet."

"When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong."

"I'm sure the universe is full of intelligent life. It's just been too intelligent to come here."

"1. When a distinguished but elderly scientist states that something is possible, he is almost certainly right. When he states that something is impossible, he is very probably wrong.2. The only way of discovering the limits of the possible is to venture a little way past them into the impossible.3. Any sufficiently advanced technology is indistinguishable from magic."